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Provides events when some command operations modify the state of the 
Design Engine.


<h2>Package Specification</h2>

The application modifies a report design using a set of <em>commands</em>.
Each command will send notification event and throw exception if an error
occurs.
<p>
<ul>
<li>An exception thrown if an error occurs. Many exceptions provide
detailed error codes to clearly identify what went wrong.</li>
<li>A notification event sent to the UI each time the operation is
done, undone or redone.</li>
</ul>

<h2>Related Documentation</h2>

The application generally uses the API handle classes to work with a
design. These handle classes use the commands defined here to modify
the design.

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